[e2e] e2e principle..where??....
J.Crowcroft at cs.ucl.ac.uk
Mon Jun 4 00:14:34 PDT 2001
In message <188.8.131.52.2.20010603190244.024287a8 at central.cis.upenn.edu>, "Jonathan M. Smith" typed:
>>Here's a question I once posed in a debate with you at SIGCOMM in Cannes that I
>>have never fully resolved in my own mind. Does the end-to-end argument support
>>routers as they work today in the Internet? For example, why not source routing
>>as a more "pure" end-to-end strategy? I'm not trying to be antagonistic - I'm
>>trying to understand whether the routing control plane (which is network
>>the Internet) in fact complies with the e2e principle.
so i see the e2e principle as another instance occam's razor -
when choosing what to put in network or transport layer, you want to
haev the simplest solution - putting source routing into the
end system requires end systems to build topology
maps - to do so thewy talk to the topology (routers) -
this doesnt reduce the complexity at all (there's no free lunch), and does
reduce the responsiveness since you ONLY get to react edge-to-edge to local outages
instead of having local recovery
having the ability to put route _hints_ into packets would be very fine if
(as we do e.g. in ipv6) we had a mechanism to do it without burdening everyone with
paul francis' phd thesis is jolly good on this topic...
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